pessimist

One who accepts the metaphysical doctrine of pessimism, in either sense.

One who exaggerates the evils of life or is disposed to see only its dark side; one who is given to melancholy or depressing views of life.

Same as pessimistic.

Of or pertaining to pessimism; characterized by pessimism; gloomy; foreboding.

One who advocates the doctrine of pessimism; — opposed to optimist.

One who looks on the dark side of things.

Someone who given a choice of outcomes, believes the worst is more likely.

a person who expects the worst